If they're at storage charge (and 3.8v seems about right, using a Hyperion Superduo mine go to 3.9) you should find the tigers will doze happily for weeks with no bad things happening. For long term storage, if you feel worried, then you might want to get ammo boxes in which to store the Lipos (e.g, http://www.amazon.com/GI-7553296-Cal-Ammo-Can/dp/B000J4HXUC) but be sure to drill a pressure relief hole in the lid or the base so that if one of the tigers ignites it doesn't turn the can into a bomb. I've not heard of the LiPo's spontaneously igniting at storage charge -- only when they're been mistreated, over-charged, over-discharged, or you've forgotten to change their kitty litter. (Joking re: litter.) Did you see such stories? Andy.